SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 SQ25

2011 SQ25

2011 SQ25 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.445 AU once every 1.74 yr.

Amor Observations: 46
Orbital Period · P
1.74 yr
v(q)
31.9 km/s
v(Q)
19.2 km/s
Diameter · ≈
0.07 km
TJ
4.62
Eccentricity · e
0.2483

Orbit and dynamics

The path is an ellipse reaching 1.086 AU from the Sun at perihelion and 1.804 AU at aphelion, a radial span of 0.718 AU.

Applying Kepler's third law to a = 1.445 AU gives an orbital period of 1.74 yr, or about 634 days.

An eccentricity of 0.248 makes the orbit moderately elongated.

The orbital plane is tilted 5.4° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.9 km/s at perihelion and falls to 19.2 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 46 observations and has a weighted RMS residual of 0.4093 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

About these computed values

Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Orbital Parameters

Semi-Major Axis
1.445 AU
Eccentricity
0.2483
Perihelion
1.086 AU
Aphelion
1.803794 AU
Inclination
5.4°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
169.88°

Orbit diagram

The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.

3D orbit (interactive)

Drag to rotate; scroll or pinch to zoom. The Sun is at the focus (orange), Earth's orbit is the grey ring at 1 AU, and the red dot marks the object's current position.

Close approaches

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2037-Jul-13 09:22 0.332365 AU
49721169 km
2.23 km/s
2037-Oct-02 09:52 0.329049 AU
49224993 km
10.69 km/s
2044-Sep-23 10:26 0.072372 AU
10826722 km
4.06 km/s
2051-Sep-12 12:05 0.177782 AU
26595753 km
7.10 km/s
2058-Dec-14 18:59 0.400490 AU
59912503 km
4.99 km/s
2077-Sep-30 08:21 0.145439 AU
21757324 km
8.34 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
23.6

Orbit Quality

RMS
0.40928
Condition
6
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Keep exploring

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